Heather Piwowar · Jason Priem · Vincent Larivière · Juan Pablo Alperin · Lisa Matthias · Bree Norlander · Ashley Farley · Jevin West · Stefanie Haustein
Despite growing interest in Open Access (OA) to scholarly literature, there is an unmet need for large-scale, up-to-date, and reproducible studies assessing the prevalence and characteristics of OA. We address this need using oaDOI, an open online service that determines OA status for 67 million articles. We use three samples, each of 100,000 articles, to investigate OA in three populations: (1) all journal articles assigned a Crossref DOI, (2) recent journal articles indexed in Web of Science, and (3) articles viewed by users of Unpaywall, an open-source browser extension that lets users find OA articles using oaDOI. We estimate that at least 28% of the scholarly literature is OA (19M in total) and that this proportion is growing, driven particularly by growth in Gold and Hybrid. The most recent year analyzed (2015) also has the highest percentage of OA (45%). Because of this growth, and the fact that readers disproportionately access newer articles, we find that Unpaywall users encounter OA quite frequently: 47% of articles they view are OA. Notably, the most common mechanism for OA is not Gold, Green, or Hybrid OA, but rather an under-discussed category we dub Bronze: articles made free-to-read on the publisher website, without an explicit Open license. We also examine the citation impact of OA articles, corroborating the so-called open-access citation advantage: accounting for age and discipline, OA articles receive 18% more citations than average, an effect driven primarily by Green and Hybrid OA. We encourage further research using the free oaDOI service, as a way to inform OA policy and practice.

4th degree connections


Conceiving, Writing and Publishing a Scientific Paper
Amfiteatru Economic 2018 (https://doi.org/10.24818/EA/2018/47/235)
I consider that the second edition of the book “Conceiving, Writing and Publishing a Scientific Paper. An approach in the context of economic research” is a work of high scientific standing, excellently documented, addressed to knowledgeable reader...

3rd degree connections


Editorial Volume 8, Issue 1 2017
Student Success 2017 (https://doi.org/10.5204/ssj.v8i1.372)
Welcome to the first issue of Student Success for 2017. Following the tradition initiated in Volume 7, this editorial has two parts: The first part continues our objective of creating awareness of good practice in scholarly publishing in an Open Acc...

4th degree connections


Ethnopharmacology and Therapeutic Value of Bridelia micrantha (Hochst.) Baill. in Tropical Africa: A Comprehensive Review
Molecules 2017 (https://doi.org/10.3390/molecules22091493)
Bridelia micrantha is traditionally used in tropical Africa to treat a wide range of human and animal diseases. The aim of this study was to summarise the research that has been done on the ethnomedicinal uses, phytochemistry and pharmacological prop...

3rd degree connections


Measuring scientific impact beyond academia: An assessment of existing impact metrics and proposed improvements.
PLoS ONE 2017 (https://doi.org/10.1371/journal.pone.0173152)
How does scientific research affect the world around us? Being able to answer this question is of great importance in order to appropriately channel efforts and resources in science. The impact by scientists in academia is currently measured by citat...

4th degree connections


Therapeutic Effects of Traditional Chinese Medicine on Spinal Cord Injury: A Promising Supplementary Treatment in Future
Evidence-Based Complementary and Alternative Medicine 2016 (https://doi.org/10.1155/2016/8958721)
Objective. Spinal cord injury (SCI) is a devastating neurological disorder caused by trauma. Pathophysiological events occurring after SCI include acute, subacute, and chronic phases, while complex mechanisms are comprised. As an abundant source of n...

Copy below code to your website in order to embed a kmapper preview widget of this article.
<script id="kmapper_widget" src="https://kmapper.herokuapp.com/embed.js" doi="10-7717-peerj-4375" width="240" height="240"></script><div id="kmapper_badge"></div>